Data Sheet
Earth’s Magnetic Field
Angle α
(degrees)
Current
Current
Current
5 loop
(A)
10 loop
(A)
15 loop
(A)
20
30
45
BL =
Angle α
(degrees)
BL
5 loop
(T)
µIN
2r
BL
10 loop
(T)
BL
15 loop
(T)
20
30
45
\
Angle α
(degrees)
B
B = L
eh tan α
Beh
5 loop
(T)
Beh
10 loop
(T)
Beh
15 loop
(T)
20
30
45
The average of the nine values in the table above yields the earth’s average horizontal magnetic
component, Beh − average .
Beh − average =__________T
Use this value along with your dip angle (theta) to find the magnitude of the earth’s total field. See
figure 22-3 .
θ = ________ degrees
Btotal = Bet =____________
Use 50 point format (which is on-line).
Turn in data page
Answer Questions (replace question three with the following question):
Data Sheet
Earth’s Magnetic Field
#3. Magnetic declination is defined by Answers.com as “At a particular location, the horizontal
angle between true meridian (true north-south line) and magnetic meridian (direction of
compass needle).”
What is the magnetic declination of your hometown, New York City and Los Angeles, CA?
Please include where you are from.
You can to go to this website for magnetic declination.
Show one sample calculation for Be , Beh and Bt
http://www.magnetic-declination.com/